MapMaker

Just read an interesting story in the Chron today about Ronald Clark O'Bryan (link). I consider myself pretty well-schooled in Houston's macabre history and had not heard of him before. I thought Dean Corrl was Houston's only notorious "Candyman" killer in the 1970's, but I guess not. Anyway, I have been working on a map project of sorts for the last year, in which I've been pinpointing the precise locations of various historical events, offbeat attractions, and sites in Houston. I'm trying to find Clark's old address (the house where the poisoning presumably occurred) so I can include it on my map, but have been unsuccessful thus far. Does anyone remember where this happened? Even just a street name would help.